﻿#include <iostream>
#include <vector>
using namespace std;


class Solution
{
    int dx[4] = { 0,0,1,-1 };
    int dy[4] = { 1,-1,0,0 };
    int m, n, prev;
public:
    // 733. 图像渲染
    vector<vector<int>> floodFill(vector<vector<int>>& image, int sr, int sc, int color)
    {
        prev = image[sr][sc];
        if (image[sr][sc] == color)
            return image;
        m = image.size(), n = image[0].size();
        dfs(image, sr, sc, color);
        return image;
    }

    void dfs(vector<vector<int>>& image, int i, int j, int color)
    {
        image[i][j] = color;

        for (int k = 0; k < 4; k++)
        {
            int x = i + dx[k], y = j + dy[k];
            if (x >= 0 && x < m && y >= 0 && y < n && image[x][y] == prev)
                dfs(image, x, y, color);
        }
    }
};

int main()
{

    return 0;
}